IC-NQ Datasheet, PDF (14/25 Pages) IC-Haus GmbH – 13-bit Sin/D CONVERTER WITH CALIBRATION

iC-NQ
13-bit Sin/D CONVERTER WITH CALIBRATION
Rev D1, Page 14/25
Incremental output to A, B and Z
There are two criteria which must be considered when
setting the maximum possible converter frequency via
the FCTR register:
nals. A digital zero-delay glitch filter then takes care
of a temporal edge-to-edge separation, guaranteeing
spike-free output signals after an ESD impact to the
sensor, for instance.
1. The maximum input frequency
2. System limitations, e.g. due to slow counters or
cable transmission
When facing system limitations it is useful to prese-
lect a minimum transition distance for the output sig-
A serial data output is simultaneously possible at any
time, using the BiSS or SSI protocol. However, for the
transfer of angle data to the output register the incre-
mental output is halted for one period of the clock sig-
nal applied to pin MA.
1. Max. Possible Converter Frequency Defined By The Maximum Input Frequency
Output Frequency Resolution Maximum Input Frequency Restrictions
FCTR
0x0004
fout @ fin_max
A, B
325 kHz
Requirem.
bin dec
XX
fin_max
f(OCS)min / 40 / Resolution
at high input frequencies
None
0x4102 542 kHz
X X f(OSC)min / 24 / Resolution Relative angle error 2x increased
0x4202 1.08 MHz
X X 2 x f(OSC)min / 24 Res.
Relative angle error 4x increased
0x4304 1.3 MHz
X X 4 x f(OSC)min / 40 / Res.
Relative angle error 8x increased
Notes *) Calculated with fosc()min taken from Electrical Characteristics item A01.
Examples*
fin_max [kHz] at resol.
8192 1024 200
0.16 1.27 6.5
0.26 2.1 10.8
0.53 4.2 21.6
0.64 5.1 26.0
Table 15: Max. converter frequency for incremental A/B/Z output, defined by the max. input frequency
2. Max. Possible Converter Frequency Defined By The Minimum Transition Distance
Output Frequency Resolution Minimum Transition Distance Restrictions
Example*
FCTR
0x00FF
fout @ t_MTD
A, B
10 kHz
Requirem.
bin dec
XX
at A, B
t_MTD
2048 / f(OSC)max
at high input frequencies
None
t_MTD [µsec]
22.8
0x00FE 10.05 kHz
X X 2040 / f(OSC)max
None
22.7
0x00FD 10.09 kHz
X X 2032 / f(OSC)max
None
22.6
...
...
... ... ...
...
...
0x0006 366 kHz
X X 56 / f(OSC)max
None
0.62
0x0005 427 kHz
X X 48 / f(OSC)max
None
0.53
0x0004 512 kHz
X X 40 / f(OSC)max
None
0.44
0x4102 854 kHz
X X 24 / f(OSC)max
Relative angle error 2x increased 0.27
0x4202 1.7 MHz
X X 12 / f(OSC)max
Relative angle error 4x increased 0.13
0x4304 2.1 MHz
X X 10 / f(OSC)max
Relative angle error 8x increased 0.11
Notes *) Calculated with fosc()max taken from El.Char. item A01; the min. transition distance refers to output A vs. output B
without reversing the sense of rotation.
Table 16: Max. converter frequency for incremental A/B/Z output, defined by the min. transition distance